Solution: please check whether the third party lock screen application is installed on the mobile phone, or test whether the power key is effective in other applications. If a third-party application causes the volume key and power key to fail, uninstall the application.
Please try to press the power button until the phone vibrates and restart the phone.
Please back up the data in advance and try to restore the factory settings.
If the problem still exists, please back up the data in advance and bring the purchase invoice to the after-sales service point for maintenance.